5-(1,1/2a+1/3)*6=2,1/3a-5,1/2
5-(3/2а+1/3)*6=7/3а-11/2 5-9а-2=2 1/3 а-5 1/2 -11 1/3а=-8 1/2 а=-8 1/2 /11 1/3 а=3/4
5-9а-2=2 1/3 а-5 1/2 -11 1/3а=-8 1/2 а=3/4